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Finding the Fourth Proportional to 811.88, 1,120.34 and 480.50

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Solution

The fourth proportional to 811.88, 1,120.34 and 480.50 is: 663.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.88 : 1,120.34 = 480.50 : x
  2. Step 2: Convert to fraction form
    811.88/1,120.34 = 480.50/x
  3. Step 3: Cross multiply
    811.88x = 1,120.34 × 480.50
  4. Step 4: Simplify right side
    811.88x = 538,323.37
  5. Step 5: Solve for x
    x = 538,323.37/811.88
  6. Step 6: Final answer
    x = 663.06

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.